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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8acdf769aa51cb5520dc272d9fe007c07cbf2974d49c9bafaca9735a1e9cc8' 
  AND token = 'K/b6Xiov4bRB5FIKF31x+39vubAs9ig5fzMNKhbujxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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