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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a94d3ab863ce49bb3fb7e5adddea4cb3dacdc51066b7ab021d1a48355977f4' 
  AND token = 'VXbCmqg81zpuqOVriLjertyy4TkugkiU6kA0st+kAR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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