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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889b671eb39c57cfc2f4e6f0f21d9f7eb71931e6879f0b2742960336f5217719' 
  AND token = 'fDMyTMNcPyT2lj5B28TQUx9silXa3SGOXQ53NVR0gpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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