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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dace9068cb332d2873cf09003b427f1ea8f14bdf29e3589bbda7279d01bb4abf' 
  AND token = 'zcHK2ThEHPy9tSzTcjxzCFbA9JlqQdi/YhI8vK+X/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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