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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c2e64dbbc1f05aee7cecd43c175117e7be7346c16c7e9ff1f0b198e467566a' 
  AND token = '5MuNi80Vby1Wgr6kS7yFW6iYJSorLliqXgd7wGiis08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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