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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f8ac59f174368e7bc415bd37e983a8778948961ed8f58cbc62a1ea4b40d716' 
  AND token = 'leKaN4nX+it1I0aoTC9bc1MZC4NTSEMhRaElj9Thmv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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