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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515b6ed115f8db64c8d2f36a946af9545050bcbeedc210edb123df2e93fb6b87' 
  AND token = 'g3J6DqMygGLszV4J4Lt/APodjtUyRMEWTQVcW/fgj0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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