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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e45b59f5f406284bc4924abdfa915d7a93b8ff69fb2ad176aa6cd368d72167f' 
  AND token = 'XrFwSxK83n6LLFWq6ijStqX5oh6iqjk3nSMJRyj5bYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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