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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d03f749fa7a04763936b6f93d6919bdf29a374e1e2cd65b38530f7226b938a' 
  AND token = 'X2aF72niQfPfQr6wzz+1hEXEZSk6O4j/7Q7N4+bbXwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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