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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99188be7c2bcd60aa5731dc2ac0e0683d811d6ff4899a3a8396ab0f72f183913' 
  AND token = 'NBjUTe0UwaepIDSHn2v9Zod9nYfe8S5qTniyyBMOb3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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