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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405873f1954311fb200e2a9a0077ac41049160392ac8b5c58c8058940177d2be' 
  AND token = 'gpGwoZe1Sih63ECsNPt1EM9X5m9QaN7AoWzG+J2V9vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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