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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffff02bb54f5afe69dd9796c2681b7ed355af3106abd7b605ede97a3c21d315' 
  AND token = '105uy92gJz+rPVybLIjYpgBGIq9cHVmAQx1Xuoyzd5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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