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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928e5c4ddfab707c8793546df820c32c84342bd3eeda9a57f1eb1d35355941d6' 
  AND token = 'zI8wr1A8GEfaSpkk3/kGsbQRZG7xMVWui+f+0rXiDoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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