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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38114abea1f774a51529a322d2cedf69acde06b691f7d14df73726e8e971f7dd' 
  AND token = 'fOXyJ9hn3G9C2ORwG+mg+5Q3/02hMG/fhWfU0NmHl9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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