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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d19ff509a14bd9db7ab0c4cb0c49d8f16b6205a92fe97fb9870f8671ec4f94' 
  AND token = '2p7pwq0D0ioWClXkiJq2HAVLTDrsBFU3HSMhvEhu9X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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