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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43366995e55cef3003410b9ca357820e4c9ae8f8ecf8ec97570e41c7403e2aea' 
  AND token = 'jpp9d0CONapGRf7GkiC7i6DVawyAJXKu1MP9H8bt/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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