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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079c4c1a5832d940e4edd6c2bf8fef4cb89dc7a2aa21844098fb73ec530151ce' 
  AND token = 'CJaVB0oTZJL3482jlsCC80x/3O6Tpo7fZnUaZPgTCDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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