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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b896677c9216bc7912c0f5038a25b138b5305f866c88ff0e08e6233dd0a25c' 
  AND token = 'ktPv1qXJClw82495LPzpkaEt442mAeZ8mMsYneHEink=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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