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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fb435a68210691ace2deebe1be7b7c1b2373e95711536e8b688c9ebef6cb7d' 
  AND token = 'hoW2M42aUEgkzktGHTU2xpAzQy0pKMmIc22TTqJBq3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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