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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd18c5409567098aec58a79d29834c60bd148a90310732aa206062a7b458c3d7' 
  AND token = 'PeXsk80avg276dAuSqP8YJxZp1Lz4RQSJtGCEdDLm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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