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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efca5544e6d8a9103dbf6ab528b79d97fb4b3af5f898f708f72ea4829dd7083a' 
  AND token = '8yri66hV4TXdFSJusnKKBAn04k3NBk1LGTElm3D07f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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