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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4bbdb02d8be02ea59f8fbb919a6931d24be200489c27a2f3aaa152709a410d' 
  AND token = '8rVdKFQumEyov/P2GcY0CzdsswEC/LU0e6+g42q85EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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