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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c8153ae32367574ed8c8579650fa0ff2f808d6bd6aa62f5cf48d0c36c0b9ff' 
  AND token = 'yInbJUpLs1ExZhdB59aHcRbdUDg+OMBj+/HAfu8uEVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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