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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a631e0374d90b5b4232b4927b54c6e6732cca501a7323a9b2748686149de06bb' 
  AND token = 'ys0+WbI+7+HxjAhIfcLsKzY9dAUNXw0aOVr/MZNd8Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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