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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a514bf76b34616be1f35f2d3963cf1a510dfefbc2dba6613fc94b6a316a94f66' 
  AND token = 'zuP5yxBMvX3fWgsolob319mVu4RVpz1FM5G0decPe+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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