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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb57cd9226ff9cf726ad38b13f8b251983c07a74484e41e3ab23b2657bfa98d3' 
  AND token = 'by1VAUJNyBWgM4B9kvGPVdooLNOOSdkyf5NAZ8O9Vls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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