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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04d803c1e5b2c11b9e45f0790fff4af39beb44ce1f21d2882fbe1787696f98e' 
  AND token = 'uXQOowyJfSa0Y41czbklvR6DUTr815D+oc7EyP7RkAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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