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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd34013bd92ee79554d63a1c35eae5025e5ed1d0e9c44afca40bfbcbf6697ee9' 
  AND token = 'ifbSU5Bxcv3VKZ+SKojoQWH2h9UzdGAVgWsfkTz1UXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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