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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8f49f4b1a7683083a9f5e4ec918e7d116a312fced0cf16ed75cf751d2d78c8' 
  AND token = '3RtpW3BHhhYRxr7bXEpy7+4bapAvjQPQLmijYkm520Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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