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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093feb9336b393d7f29d6ebdd0c93d3577f9d83a3f6fc2ce47f6986dc6359dfe' 
  AND token = 'sbCS/5UP/yAL9prKsFLrrpJzXRY3fo4yOhKIVod0qfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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