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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feaddb5ec157c9748d1425e1015ff9407e4ac9f3fd7af18b2136234cfefdfc24' 
  AND token = '1hP2Z/rfFm0A7iHGonbKNpfsNSlI/JP6KtdX0Nu+jho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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