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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89213bfd642df9bd817cd1c6eeb041e1f4e14d826f0c1d04c51ad9ab8569d4a' 
  AND token = 'VFtF9G+kFDeOunnGXCo2lmGlbOeYDkMthem740rG6k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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