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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6268de0834eb557dd56dc7b81e29b483542ababf674231fe401a372a9480ba01' 
  AND token = '8gSLs0i6g0TtfQGqsHKcaWZVKeR+l3lPKmddfdaZXgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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