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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2619f2969f4a578a5c50fdc626fa9e11147226862a64acd4ae5921da69d4d2' 
  AND token = 'AgBheXQNirH4UCW6jz1+KQXQ4A2UR6YhO3d/cUV7w94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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