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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daf06043f3afcde7ef0551f24bcaa7ff658368c1a9921f4f206626b9e1df4b4' 
  AND token = 'OsKhIbf/MY7X9UsUcwfZIO6sOI3TY0KfK2I4ctS2xhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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