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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd105f1cbc3698762bcbe358bbe94d9ce6efad6b30ef4dc66256ebd343100059f' 
  AND token = 'MGq50uAxeNoU0S7FIxRR/29ntfz8aVWQjB4Tar14fWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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