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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0258ef18942268427ca4a6bf748414fdfe4ee8dad0794b7bddd2f47c16f982d4' 
  AND token = 'kEP9xi5+KoP8V8W8hPQl6G91K2RbY2aOcyWGqbIa9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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