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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6c8348f2faefbd9f4d2af29cfd7b28033e9cb3ee9f2547291e0581ee6f2881' 
  AND token = 'LxtCO6nor71BUh7X+q8Cv1UPdR+WkoHYCz1eEbayTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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