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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2814f1940904c9ccfb3291718419fc6a6878eb8b88d349284cad54199a7da1e3' 
  AND token = 'h3t+HBGL1DOlyvZdSlCzyck/4AgMmVPN2uVwe31VfXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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