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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c395396d1773876262f10c0c4e832b5e9a5d96a9dec29830270bd54c91b311' 
  AND token = 'Q4j9GaEttpbFFD9PT7OwqA83Y6ljMP6TuNHUI+oI7yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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