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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0551a9a6cf52b7aef95ee1c195bacffcfa93b1318e339472829b1fe1dc15e058' 
  AND token = '33jYhDScAphtqs9ANSIiYV2Tm2sjEvpeRdhmzSVbr6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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