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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a514944bddb9de991054625f1fffd44f26bef5e494daf9afd3282b159a2dc1e' 
  AND token = 'FuXSd1EimldFqkAks/qHo6xMSUJ8JN/bpoZl9bL7NW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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