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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc37ee7f511d81d2367d040e181f50833d4e90131186f37525f98f6dee2e44e' 
  AND token = 'iYBUhWhsqv8gVEjl3aBos1QnSVViz8z4lA7j9BNYijE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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