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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da619d98fb576676275e6fcb1cd4ce1a482c9e095e11751e687a2f0c161c6e6a' 
  AND token = 'yYAxl8I6yd1PGGTFC0sd5zdeDJNUe9Cqa4j976jy1QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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