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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e32e9b439df26f95c00f939c2060db43eb268980946d86a9fffcf9270339619' 
  AND token = 'IyNlw0iJvayfnBVYzFqu6TT5l+7UCKofHT97RYzrrW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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