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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2516ce85d2829f48916d85ebd3a9c419be9a3d25d0f709a1136747112c2c7188' 
  AND token = 'YINOE3hx9Tkg5NzZAJhKClwWDkw0BHou0oNUneQ2Kbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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