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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b05a9462e9116a59f5d14b4abee371573310ebde29ff1cbed2980594ae7085' 
  AND token = 'x0d8Iw5FYE7IJWXCVKAWlgEf7pF7rWkdUD7rZK3+kjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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