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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3898f5d7b79e952ea13ac6de5383cc058cd9d31537aaaad07f859029d241aaa1' 
  AND token = 'N+kAnxoPR5FZHBTpTe3S2f6OG4wiz1IFp/UGvSvTF/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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