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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd740269607075e95bf95432cdbf55ccd278b25abc28d1bcf409888e57e5d9306' 
  AND token = 'X39GAGte02dVnkQCWZkGS7eNzt4dr23eAwUymzTd73g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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