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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e27639f4fb5b29c2647eb6439401c40d584f66be2541211bb845e2245415518' 
  AND token = 'mM8LRBgE5mWf2d1PUUUdZ22cK7rpjzdgaxr50w1Xqvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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