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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b634a8cc34055f461f617b9fa67f095edb374ed25238a0df7b34ecbb68af037' 
  AND token = 'Ona24F8SVVFxRYjU0nkLFXeIoqk6fRJanQ1/Dh06wHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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