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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89272b0f05d81c808ccd75a142fdadcfb7a1ffe5b3ec06eac29b6ec65089110c' 
  AND token = '8kc8wqD1jVpA88DZtZYvTutSvqoZavyrexx75EXzYL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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