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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cc5b023994688a5976706d1f636a629894c89b63d544c2d77a01b5f7e4e4fc' 
  AND token = '2b5PpStdyl0bODdt3HGpcjvUjThhHNVS2gWzut5MVmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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