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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ec5802d513084363ea85cb8696e22c6c90c8b950503a8000d0fb3d5426c68e' 
  AND token = '8T8IXwZyFNqHRH70C01y4VKmZS3X9VEAGVi6YoxSsoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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