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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa98f77bd1d07fd98973b1447067abfef15048cd4f47ae8b7d270647c20ce9b0' 
  AND token = 'dwWE7gJXU3ZukAPH2I1ha5ev52S+AYuCiaJLoynxmxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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