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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13294ce323c83907732edba9db5c80e9da26585098b504efa4472c2b8b6118c' 
  AND token = '6llIABZ7dirWJQLNjWqgEb6omUbyK9ykUYh40gmaVu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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