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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e33a4e1724e58a1b9447e0aa32bdaf6757492b6448365b5dc19b40ab21c2254' 
  AND token = 'bhLH/it9yxfGDELS9a8tVy2+6m3zjWTq/wwU56+VLeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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