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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e48a4d8f8614d1f24ddfcbefce8b3ea27269e19633755e193596904df50585' 
  AND token = '87Xbd+YuJWi5h13cZ3gu4af6a9G08ztC/C5VP6IJXFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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