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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6fe15c8b41a88cc1b0ebd926de378f9f83074392c6b758dbae42aff8b1d2b9' 
  AND token = '7UXgH5STeM16+O5RT5f9c24lf3Vq8bsVEVRr659+gBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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