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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10abf84a77e3b481c092720e3b71924cec0a6ebf9754d8cdaf39e86541676120' 
  AND token = 'mLnyYBK4x4u9VNCbPQ21ppgYhrwcTN/KFAnKx/l1dCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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