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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bce5fc784420d2e132ce65bfffcf3578c1cf682a9a1e0dd35188f9c3f5bb59' 
  AND token = 'Ta2IgeOUYW8qedfS/d5+55bs56+R8uWix3hZCKfhNK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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