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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c03eb5bd8ff59b8e20d9c9db5c84755c40a7ee5d816fa997da1e8419072216' 
  AND token = 'WfU8vVi7oQHuJ3StKnkTBU6m0Qg3GjOjDzVp0MnMmEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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