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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee30c950c87a603270f6d5359b752ed487f71f8a5be9d7d7836cba90d568fcf' 
  AND token = 'TgybEigGs5RJEIRAAYDi9sV1M7+oH85us6KIaa6bQaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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