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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba4cfa4a6bb5444843d9356908bb09ace6339ee429d3f684420188d70790c6b' 
  AND token = 'As4mTVTse1R3D6m+cy+Cks0zoHxh5eklRYqmA8mi0Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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