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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9817edd3768636d55e172da47d1f15be5911d2954e311036f3ee6db3b27d7e9' 
  AND token = '6TqY2Xlw3kSeVvPeOowsVnnp+hCnG6WQOeKRxYqt+4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}